수정

src/app/posts/[id]/page.tsx

@@ -23,12 +23,44 @@ export default async function PostDetail({ params }: { params: any }) {
   const parsed = settingRow ? JSON.parse(settingRow.value as string) : {};
   const showBanner: boolean = parsed.showBanner ?? true;
 
+  // 현재 게시글이 속한 카테고리의 보드들을 서브카테고리로 구성
+  let subItems:
+    | { id: string; name: string; href: string }[]
+    | undefined = undefined;
+  if (post?.boardId) {
+    const categories = await prisma.boardCategory.findMany({
+      where: { status: "active" },
+      orderBy: [{ sortOrder: "asc" }, { createdAt: "asc" }],
+      include: {
+        boards: {
+          where: { status: "active" },
+          orderBy: [{ sortOrder: "asc" }, { createdAt: "asc" }],
+          select: { id: true, name: true, slug: true },
+        },
+      },
+    });
+    const categoryOfPost = categories.find((c) =>
+      c.boards.some((b) => b.id === post.boardId)
+    );
+    if (categoryOfPost) {
+      subItems = categoryOfPost.boards.map((b) => ({
+        id: b.id,
+        name: b.name,
+        href: `/boards/${b.slug}`,
+      }));
+    }
+  }
+
   return (
     <div className="space-y-6">
       {/* 상단 배너 */}
       {showBanner && (
         <section>
-          <HeroBanner />
+          <HeroBanner
+            subItems={subItems}
+            activeSubId={post?.boardId}
+            showPartnerCats={false}
+          />
         </section>
       )}